Engine with rotary cylinders.



PATENTED JULY 23, 1907.

M. BUGHERBR.

ENGINE WITH ROTARY GYLINDBRS.

APPLIOATION FILED MAB.18, 1907.

Nro. 860,899.

UNITED erratas MAX BUGHERER, OF ELBERFELD, GERMANY.

ENGINE WITH ROTARY CYLINDERS.

Specification of Letters Patent.

Patented July 23, 1907.

Application iiled March 18,1907. Serial No. 363,104.

To all whom it may concern:

Be it known that I, MAX BUCHERER, engineer and manufacturer, a subjectofthe King ol Prussia, German Emperor, and residing at No. 31-39Arndtstrasse, ol Elberfeld, in the Kingdom ol Prussia, German Empire,have invented new and useful Improvements in Driving Mechanism forPiston-Engines with Rotary Cylinders7 ol which the following is aspecification.

The use ot' piston engines with rotary cylinders is already known andalso it is no longer new to interpolate between the driving crank, olpiston engines with fixed cylinders, and the driven shalt a wheelmechanism lor overcoming the dead point positions.

The object of the present invention consists, however, in theapplication ol such a wheel mechanism in piston engines with rotarycylinders, thus necessitating a modified arrangement ol the wheelmechanism.

The object ol the invention is shown in the accompanying drawings inwhich Figure l. is a longitudinal section ol the engine with a pair olrotary cylinders; Fig. 2, is a cross sectional view of Fig. l.

This drawing shows two toothed wheels a b one inside the other ol whichthe internally toothed wheel a is connected with the rotary cylinders eand f, while the other wheel b with external toothing is firmlyconnected with the driven crank shalt d. wheels are in the proportionoi' 1:2 to one another, and the diameter ol the wheel with internalteething is equal to the entire cylinder movement, while the small lacewheel b is equal in diameter to the diameter o'l the crank circle anddouble the axial difference between the crank axis d and the cylinderaxis g, and stands in engagement therewith. New il the engine be causedto rotate by explosive gas, the pistons exert their force on the singlecrank l which rotates at hall the speed ol the cylinders, simultaneouslywith the displacement ol the two pistons and rotation ol the cylindersby means ol a bearing or eyelet connecting the two toothed wheels. Thepower transmitted lroin the pistons to the crank and shalt d is nowtransmitted by the small belt pulley k as uselul work. As the powerexerted by each motor undergoes a constant fluctuation during theworking, il the power were directly transmitted to the crank shalt,cylinders with a cylindrical axis would have a tendency to leading andlagging, which would be apparent by the piston heads pressing againstthe cylinder walls. `rlhe consequence of this would be that alter ashort time of working the cylinder walls and the piston heads wouldundergo great wear, and also the effective power el the motor, inconsequence ol these frictional losses, and also ol the defectivepacking of the pistons, would be considerably diminished. The crankshalt, which rotates with the crank pins, would also have to Thediameters of thebe considerably stronger for transmitting thesepressures, and would be exposed to a strong bending strain. In order toavoid these drawbacks by means oi toothed wheels, on the one hand theproportions of transfer irom the crank to the cylinder axis must amountto 1:2 and on the other hand the course ol the crank pin in eachposition must move on the middle axis of the pei'- ioration ol the twocylinders corresponding to the movement ol the pistons and piston rods.The irregularities hereby arising in the generation and development olpower a're absorbed by the toothed wheels.

In Fig. l, e and f are two revolubly mounted cylinders lying oppositeone another, g the hollow axis ol the same with keyed on belt pulley h.The crank axle d with crank Z is revolubly mounted eecentrically to thehollow axis g in its continuation, and a small belt pulley c keyed onthe crank axle, so that either the one or the other or both belt pulleysmay be simultaneously used as desired as driving pulley. The smalltoothed wheel b is keyed en the crank axle d and the large toothed wheela brought into revoluble engagement with the wheel b eoncentrically tothe cylinder axis g, both toothed wheels are therefore revoluble ontheir middle axis. When the motor has been started, the crank-shalt d isrotated by the action ol the piston and piston-rods upon the crank l,and thus also the toothed wheel b being in engagement with the toothedwheel a is rotated, so that the cylinders e and f being connected withthe wheel a revolve around, and rotate with the hall speed ol rotationol the shalt d. On the stoppage ol the motor il the gearing were notpresent, the pos sibility would arise that owing to the impetus of therotary cylindrical mass at the moment when the crank pin remainsstanding in the center ol the hollow axis g ol the Cylinder, the formerwould make a further rotation and only come to a standstill in aposition from which a rotation oi the motor system could no longer takeplace.

The special advantages of the arrangement are thereforet-l. To preventthe pair ol cylinders on the stoppage o the crank pin in the center olthe cylinder hollow axis turning beyond this, and instead ol taking up aposition tangential to the crank circuit assuming a radial positionthereto. 2. Where a pair ol cylinders is used, as in the lorm ol exampleshown, the arrangiement oi the wheels a and b avoid any cross-reactionoi the crank pin ol the crank Z upon the connecting-piece `ol thepiston-rods so that a bent ol the rods is prevented.

3. No cranked shalt is necessary in the arrangement, but only a simpleend crank. 4. The arrangement al.- lews el the toothed wheel with simplecranks and counter cranks having a much larger stroke and also ol abetter utilization el the gas and the entire mechanism oi' the engine.5. As the pistons reciprocate in a straight line and receive no pressurefrom-the piston rods, the former may he made ahnost as short as steampistons, so that the length of the cylinders is utilized much betterthan formerly.

Having' now described my invention7 that what I Wish to secure byLetters Patent of the United States, is:

In a piston-engine with revoluhle cylinder; the c0n1bination with saidcylinder' o'L an internally toothed wheel firmly connected with saidcylinder, and a cogwheel :1rranged inside said first-mentioned Wheel andconnected with :L crank-shaft lying eccentrically from the axis ofrotation of the cylinder'.

In Witness whereof I have hereunto set lny hand in presence of twowitnesses.

MAX BUCHERER. Witnesses WoLnmiAn HAUPT, HENRY Hmmm.

